In 2.8, Blender crashes while rendering trees
i think 6 subdivisions are way to high. reduce to 2 and test it again..
you can open Task Manager if you are on Windows and check the MemoryManagement. then see if it fills your Memory.

you can also start blender with debugging turned on then you get a report when blender crash and close and you have some more Information.

Start blender_debog_log.cmd and wait for the crash